Intestinal Phytase and Alkaline Phosphatase of Chicks: Influence of Dietary Calcium, Inorganic and Phytate Phosphorus and Vitamin D3

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AS indicated in reviews by Taylor (1965) and Nelson (1967) data are incomplete and often conflicting in regard to the influence of dietary factors on the extent to which chicks are able to utilize phytin phosphorus. Maddaiah et al. (1964) were unable to relate supplementation with dicalcium phosphate, or calcium or sodium phytates to intestinal phytase activity in the chick or the rat. Balance studies have shown (Pileggi et al., 1955) that in the rat high dietary Ca lowered phytate hydrolysis; vitamin D3 reversed this effect but the inorganic phosphorus liberated by the treatment was inadequate to prevent rickets. It has also been demonstrated that dietary vitamin D3 increases the level of phytase activity in both chicks and rats (Steenbock et al., 1953, for chicks and rats, Pileggi et al., 1955, and Roberts et al., 1961, for rats), especially when rachitogenic rations were fed. On the other hand, Spitzer et…